SilverAlloy BV-72
Nominal Chemical
Composition
INTRODUCTION
Aufhauser SilverAlloy BV-72 is a special alloy (very low level of impurities) for vacuum brazing.
APPLICATIONS
When strong, robust, integral joints are required:
- Aeronautical manufacturing and repair
- Aeronautical joining of fuel-lines
- Electrical vacuum tubes
- Linear-beam vacuum tubes (klystrons) and electrical wave guides
- Power supply surge protectors
- Automotive parts
GENERAL INFORMATION
Chemical Composition, Grade 1 (Grade 2)| Ag | Cu | Zn | Cd | Pb | P | C |
|---|---|---|---|---|---|---|
| 71-73 | 27-29 | < 0.001 (< 0.002) |
< 0.001 (< 0.002) |
< 0.002 (< 0.002) |
< 0.002 (< 0.02) |
< 0.005 (< 0.005) |
All other metallic impurities having a vapor pressure higher than 10-7mm Hg at 500°C are limited to 0.002% each. Impurities having a vapor pressure lower than 10-7mm Hg at 500°C are limited to a total of 0.075%. (This applies to all forms except powder and extrudable paste.)
ADDITIONAL INFORMATION
PHYSICAL and MECHANICAL PROPERTIES
| Solidus (Melting point) | 1436°F (780°C) |
| Liquidus (Flow point) | 1436°F (780°C) |
| Density | 10.0 g/cm³ (0.361 lb/in³) |
| Thermal expansion coefficient @ RT-932°F (RT-500°C) | 10.9 10-6/°F (19.6 10-6/°C) |
| Young's modulus, GPa (lb/in²) | 83 (12×106) |
| Yield strength (0.2% offset), MPa lb/in² | 272 (39×103) |
| Tensile strength, MPa (lb/in²) | 372 (54×103) |
| Elongation (2 in/50mm gauge section) | 19% |
| Electrical Conductivity, %IACS | 87 |
| Electrical Resistivity, 10-9 ohm·m | 20.4 |
| Knoop Hardness, KHN expressed as MPa | 1010 |
SPECIFICATIONS MEET or EXCEED |
| AWS A5.8 BVAg-8 (ISO 9002) |
| UNS P07727 |
| EN 17672 Ag 272 |
AVAILABLE FORMS |
| Powder/Paste |
| Wire, Rods*, Foil |
| Specialty preforms per customer specifications |
*STANDARD SIZES AND DIAMETERS |
| Diameters: 1/32", 3/64", 1/16", 3/32", 1/8" |
| Sizes: 1, 3, 5, or 50 troy ounces |